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The objective of the CERES crop simulation models is to predict the duration of growth, the average growth rates, and the amount of assimilate partitioned to the economic yield components of the plant. With such a simulation system, optimizing the use of resources and quantifying risk related to weather variation is possible. The cereal crops included in the DSSAT v3 models are maize, wheat, barley, sorghum, millet and rice. A feature of each model is its capability to include cultivar specific information that make possible prediction of the cultivar variations in plant ontogeny and yield component characteristics and their interactions with weather. Biomass growth is calculated using the radiation use efficiency approach; biomass produced is partitioned between leaves, stems, roots, ears and grains. The proportion partitioned to each growing organ is determined by the stage of development and general …